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Meaning of mercaptan

mer•cap•tan

Pronunciation: (mur-kap'tan), [key]
— n. Chem.
  1. any of a class of sulfur-containing compounds having the type formula RSH, in which R represents a radical, and having an extremely offensive, garlicky odor.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.